// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4
尽管这是一笔基于长期战略的资源锁定，但对于投资者而言，真金白银的流出与当期报表的承压，终究需要谨慎权衡。
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[4]《泰山石化被指濒临破产债权人要求启动清盘程序》经济观察网
Stream implementations can and do ignore backpressure; and some spec-defined features explicitly break backpressure. tee(), for instance, creates two branches from a single stream. If one branch reads faster than the other, data accumulates in an internal buffer with no limit. A fast consumer can cause unbounded memory growth while the slow consumer catches up, and there's no way to configure this or opt out beyond canceling the slower branch.
The original plan had been to begin the phase out and stop the importation of petrol and diesel vehicles from 2030.